Kim Jong-Un has called Donald Trump’s UN speech ‘a declaration of war’ and branded the US president ‘mentally deranged’ in a rare address.

The North Korean leader has hardly been heard speaking on camera before – if ever – but has made a withering speech condemning Trump on camera.

Kim has threatened the “highest level of hard line counter measure in history”, in response to Trump warning the US could destroy his country.

During his statement, Kim said the American leader should ‘be considerate of whom he speaks’ when making a speech in front of the world.

“His remarks remind me of such words as ‘political layman’ and political heretic’ which were in vogue in reference to Trump during his presidential election campaign,” Kim said.

“Now that Trump has denied the existence of and insulted me and my country in front of the eyes of the world and made the most ferocious declaration of a war in history that he would destroy the DPRK, we will consider with seriousness exercising of a corresponding highest level of hard line counter measure in history.”